The airbag fuse is an integral part of the airbag control module and is not a replaceable part in itself. The airbag control module must be replaced.
The Mazda Miata air conditioning drain to can be found on the bottom of the air conditioner compressor. The drain to runs to the bottom of the oil pan.
mazda miata air bag code 21
It should be in the air intake. It look like a light bulb filement most of the time. Look on the air intake box. Also look in the tube coming from the cowl.
Is it feasible and approximately how much will it cost to replace the air conditioner in my '91 Miata with a unit that does not use freon?
It doesn't have one. It uses a flapper type air flow meter which doesn't require an intake air temp measurement.
There is a problem with the air bag system. Until it is fixed the light will remain on. Take it to a garage for repair.
Look on the inside drivers door. On the door latch area there is a sticker that will give the air pressure for cold and hot air pressures.
The Mass Air Flow (MAF) sensor on a Mazda Miata is on the right side of the engine, when looking directly at the engine. It's a black, tube about 4" long, and connects right into the large, plastic black air box.
Follow the tube from the throttle body to the air filter box. Open that up with some clips or bolts. Replace.
The module is located behind the center console, right in the middle behind the radio and everything on the carpet behind it all.
The ECU has detected a problem with the SRS. It is dangerous to work on this system therefore have this repaired by a professional.